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<p>Reports Scala 2 syntax that can be replaced with Scala 3 when using <code>-Xsource:3</code>.</p>

<p>Under the compiler flag <code>-Xsource:3</code> the following Scala 3 constructs
  are already supported in <code>Scala 2.13.6</code>:</p>
<ul>
  <li><code>?</code> instead of <code>_</code> as wildcard marker in wildcard types</li>
  <li><code>case</code> in pattern bindings of <code>for</code>-comprehensions</li>
  <li><code>*</code> instead of <code>_</code> in imports</li>
  <li><code>as</code> soft-keyword instead of <code>=&gt;</code> in import aliases</li>
  <li><code>open</code> and <code>infix</code> modifiers are allowed</li>
  <li>New Scala 3 vararg splices syntax</li>
  <li><code>&</code> instead of <code>with</code> in compound types</li>
</ul>
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